Abstract
Abstract The need to reduce production costs has promoted a renewed interest in using legumes as a source of N for non‐leguminous summer crops. Development of legume cropping systems which will permit reseeding of winter cover‐crop legumes is a promising approach to reducing legume establishment costs. Field studies were conducted in Alabama for 4 yr on Wynnville sandy loam and Dothan fine‐sandy loam soils (fine‐loamy, siliceous, thermic, Glossic Fragiudults and Plinthic Paleudults, respectively) to determine the effects of both cash crop and winter cover‐crop legumes in cropping systems on N fertilizer requirements of corn ( Zea mays L.) grown in a conservation‐tillage system. On the Wynnville soil, soybean ( Glycine max L. Merr.) was more effective in providing early season N, and clover ( Trifolium incarnatum L.) in providing late‐season N. The system with both soybean and clover resulted in an even more effective contribution of N to corn grain yield, and a higher yield level than that of continuous corn regardless of N fertilizer rate. On the Dothan soil, the benefits of cropping systems were not as pronounced, and the responses were eliminated by N fertilization, suggesting increased yields were due to N and not to a rotation effect. On both soils, in years of adequate and inadequate rainfall, the reseeding crimson clover system, in combination with a soybean‐corn rotation, consistently produced the highest yields of the systems studied, and provided a 68 to 159 kg N ha −1 fertilizer equivalent for corn.
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Claims 9
Claim · model-written summary
On the Wynnville soil, soybean was more effective than clover in providing early-season N to corn.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- soybeane1
- Outcome
- providing early season Ne1
- Direction
- more effectivee1
- Setting
- Wynnville soile1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilizer requirements of corn”
e1“On the Wynnville soil, soybean ( Glycine max L. Merr.) was more effective in providing early season N”
Claim · model-written summary
On the Wynnville soil, clover was effective in providing late-season N to corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- clovere2
- Outcome
- providing late‐season Ne2
- Direction
- more effectivee1
- Setting
- Wynnville soile1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilizer requirements of corn”
e1“On the Wynnville soil, soybean ( Glycine max L. Merr.) was more effective in providing early season N”
e2“clover ( Trifolium incarnatum L.) in providing late‐season N”
Claim · model-written summary
The system with both soybean and clover contributed more N to corn grain yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- system with both soybean and clovere3
- Outcome
- contribution of N to corn grain yielde3
- Direction
- more effectivee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilizer requirements of corn”
e3“The system with both soybean and clover resulted in an even more effective contribution of N to corn grain yield”
Claim · model-written summary
The system with both soybean and clover gave a higher corn yield level than continuous corn, regardless of N fertilizer rate.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- system with both soybean and clovere3
- Outcome
- yield levele4
- Direction
- highere4
- Qualifier
- regardless of N fertilizer ratee4
- Comparator
- continuous corne4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilizer requirements of corn”
e3“The system with both soybean and clover resulted in an even more effective contribution of N to corn grain yield”
e4“a higher yield level than that of continuous corn regardless of N fertilizer rate”
Claim · model-written summary
On the Dothan soil, the benefits of cropping systems for corn were not as pronounced.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- benefits of cropping systemse5
- Qualifier
- not as pronouncede5
- Setting
- Dothan soile5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilizer requirements of corn”
e5“On the Dothan soil, the benefits of cropping systems were not as pronounced”
Claim · model-written summary
N fertilization eliminated the responses to cropping systems on the Dothan soil.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- N fertilizatione6
- Outcome
- responsese6
- Direction
- decreaseinferrede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilizer requirements of corn”
e6“the responses were eliminated by N fertilization”
Claim · model-written summary
The increased corn yields were attributed to N rather than to a rotation effect.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- increased yieldse7
- Qualifier
- due to N and not to a rotation effecte7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilizer requirements of corn”
e7“suggesting increased yields were due to N and not to a rotation effect”
Claim · model-written summary
The reseeding crimson clover system gave the highest corn yields of the systems studied, in years of adequate and inadequate rainfall.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- the reseeding crimson clover systeme1
- Outcome
- yieldse2
- Direction
- higheste2
- Qualifier
- in years of adequate and inadequate rainfalle3
- Comparator
- the systems studiede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilizer requirements of corn”
e1“the reseeding crimson clover system”
e2“consistently produced the highest yields of the systems studied”
e3“in years of adequate and inadequate rainfall”
Claim · model-written summary
The reseeding crimson clover system with soybean-corn rotation provided a 68 to 159 kg N ha-1 fertilizer equivalent for corn.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- fertilizer equivalente1
- Value
- 68 to 159 kg N ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilizer requirements of corn”
e1“provided a 68 to 159 kg N ha −1 fertilizer equivalent for corn”
The same questions in other papers
Glycine max · yield · Zea mays (maize)Positive and negative results
154 papers in the same direction as this paper · 18 in the opposite direction · 7 reporting no difference from an alternative
- no effect
- positive
- positive
176 papers more in this group
See all 180 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.